DP #9: This is a for shit answer. Sorry!

Jesus is telling God, or the Householder (the cornerstone of the parable), that his power and Kingdom will be reassigned. The Householder's Son is seen as Jesus who stands before the Jewish people, priests, elders, and scribes who used their power to accept him for their own benefit; they are represented by the tenants. Jesus was crucified by these people who had been fully trusted to perform faith and respect to God as the son in the parable was and thus God's authority was taken from the hands of the Jewish people and placed before the Christians. The parable foresees this and serves as a warning to God (and to Jesus' people) that lack of respect and extreme violence is to come.